The invention relates to a hook block base body for fastening to a pulley set of a hoisting apparatus having a plurality of deflection pulleys comprising a means for installing the hook block base body at the pulley set and a load suspension means for suspending a load, characterized by at least one projection element that is configured to cooperate with a deflection pulley on an installation of the hook block base body at the pulley set and only to permit an installation of the hook block base body at the pulley set when the deflection pulley cooperating with the projection element is rope-free.

The invention relates to a hook block base body for fastening to a pulley set of a hoisting apparatus having a plurality of deflection pulleys comprising a means for installing the hook block base body at the pulley set and a load suspension means for suspending a load, characterized by at least one projection element that is configured to cooperate with a deflection pulley on an installation of the hook block base body at the pulley set and only to permit an installation of the hook block base body at the pulley set when the deflection pulley cooperating with the projection element is rope-free.

A silo-mountable rescue assembly for accessing a distressed person in a silo includes a tripod that is configured to couple to a top of a silo so that an apex of the tripod is substantially centrally positioned over an opening in the silo. A block and tackle is coupled to the tripod proximate to the apex. The block and tackle is configured to lower equipment and personnel into the silo to rescue a distressed person in the silo.

A silo-mountable rescue assembly for accessing a distressed person in a silo includes a tripod that is configured to couple to a top of a silo so that an apex of the tripod is substantially centrally positioned over an opening in the silo. A block and tackle is coupled to the tripod proximate to the apex. The block and tackle is configured to lower equipment and personnel into the silo to rescue a distressed person in the silo.

A silo-mountable rescue assembly for accessing a distressed person in a silo includes a tripod that is configured to couple to a top of a silo so that an apex of the tripod is substantially centrally positioned over an opening in the silo. A block and tackle is coupled to the tripod proximate to the apex. The block and tackle is configured to lower equipment and personnel into the silo to rescue a distressed person in the silo.

A silo-mountable rescue assembly for accessing a distressed person in a silo includes a tripod that is configured to couple to a top of a silo so that an apex of the tripod is substantially centrally positioned over an opening in the silo. A block and tackle is coupled to the tripod proximate to the apex. The block and tackle is configured to lower equipment and personnel into the silo to rescue a distressed person in the silo.

A three-dimensional construction method comprises: installing two pulleys at a predetermined interval in a substantially horizontal direction, installing two rope winders at downward position by predetermined distances with respect to the installation positions of the pulleys, respectively, and passing two ropes through the pulleys, respectively, one ends of the two ropes being connected to the rope winders, respectively, and the other ends thereof being connected to a worker's wearing tool, wherein the feeding and winding lengths and winding speeds of the two ropes of the two winding machines, respectively, are controlled to enable the worker to move to a desired position, in a space defined by positions where the pulleys are installed, and positions in contact with the ground below positions where the pulleys are installed.

A three-dimensional construction method comprises: installing two pulleys at a predetermined interval in a substantially horizontal direction, installing two rope winders at downward position by predetermined distances with respect to the installation positions of the pulleys, respectively, and passing two ropes through the pulleys, respectively, one ends of the two ropes being connected to the rope winders, respectively, and the other ends thereof being connected to a worker's wearing tool, wherein the feeding and winding lengths and winding speeds of the two ropes of the two winding machines, respectively, are controlled to enable the worker to move to a desired position, in a space defined by positions where the pulleys are installed, and positions in contact with the ground below positions where the pulleys are installed.

A bottom block assembly includes a bottom block defining a cavity and at least one opening passing through a portion of the bottom block. The assembly further includes a plurality of sheaves disposed at least partially within the cavity, each sheave having a central opening. The assembly further includes a sheave pin passing through the at least one opening in the bottom block and the central openings in the sheaves to rotatably couple the plurality of sheaves to the bottom block. The assembly further includes a plurality of captivating frame assemblies to be coupled to the plurality of sheaves, each of the plurality of captivating frame assemblies including a housing and a plurality of rollers rotatably mounted to the housing. Each captivating frame assembly is associated with a corresponding one of the sheaves. The assembly further includes a plurality of wires for coupling the plurality of captivating frame assemblies to the plurality of sheaves. Each wire is reeved around one of the sheaves and reeved through the corresponding captivating frame assembly.

A bottom block assembly includes a bottom block defining a cavity and at least one opening passing through a portion of the bottom block. The assembly further includes a plurality of sheaves disposed at least partially within the cavity, each sheave having a central opening. The assembly further includes a sheave pin passing through the at least one opening in the bottom block and the central openings in the sheaves to rotatably couple the plurality of sheaves to the bottom block. The assembly further includes a plurality of captivating frame assemblies to be coupled to the plurality of sheaves, each of the plurality of captivating frame assemblies including a housing and a plurality of rollers rotatably mounted to the housing. Each captivating frame assembly is associated with a corresponding one of the sheaves. The assembly further includes a plurality of wires for coupling the plurality of captivating frame assemblies to the plurality of sheaves. Each wire is reeved around one of the sheaves and reeved through the corresponding captivating frame assembly.